S
M
T
W
T
F
S
30
95°
71°
31
95°
74°
1
94°
74°
2
95°
73°
3
95°
74°
4
94°
72°
5
95°
72°
6
93°
73°
7
94°
74°
8
92°
73°
9
93°
74°
10
93°
73°
11
92°
73°
12
93°
72°
13
93°
72°
14
92°
71°
15
91°
72°
16
88°
71°
17
89°
71°
18
89°
70°
19
90°
65°
20
86°
65°
21
86°
69°
22
88°
70°
23
91°
70°
24
88°
69°
25
89°
70°
26
90°
69°
27
91°
69°
28
90°
68°
29
88°
67°
30
88°
67°
1
86°
68°
2
Hist. Avg.
87°
65°
3
Hist. Avg.
87°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Northwest Harris
Northwest Harris's September 2026 forecast shows daily high temperatures ranging from 86° to 95°, with overnight lows between 65° and 74°. The average high for September is 91° with an average low of 71°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Northwest Harris. See also: October | November | December.
